Meaning of allantoin

al•lan•to•in

Pronunciation: (u-lan'tō-in), [key]
— n. Biochem., Pharm.
  1. a white powder, CHNO, produced by oxidation of uric acid and the major excretory product of purine degradation in many vertebrates: used medicinally to heal skin ulcers and in lotions, lipsticks, etc., for its soothing effect.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.